(elf_link_input_bfd): Handle the case where a badly formatted input file results

in a reloc which has no associated global symbol

1 files changed, 17 insertions, 0 deletions

diff --git a/bfd/elflink.c b/bfd/elflink.c
index cd9131e..bf21780 100644
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -7019,6 +7019,23 @@ elf_link_input_bfd (struct elf_final_link_info *finfo, bfd *input_bfd)
 			  && finfo->sections[r_symndx] == NULL))
 		    {
 		      h = sym_hashes[r_symndx - extsymoff];
+		      
+		      /* Badly formatted input files can contain relocs that
+			 reference non-existant symbols.  Check here so that
+			 we do not seg fault.  */
+		      if (h == NULL)
+			{
+			  char buffer [32];
+
+			  sprintf_vma (buffer, rel->r_info);
+			  (*_bfd_error_handler)
+			    (_("error: %B contains a reloc (0x%s) for section %A "
+			       "that references a non-existent global symbol"),
+			     input_bfd, o, buffer);
+			  bfd_set_error (bfd_error_bad_value);
+			  return FALSE;
+			}
+		      
 		      while (h->root.type == bfd_link_hash_indirect
 			     || h->root.type == bfd_link_hash_warning)
 			h = (struct elf_link_hash_entry *) h->root.u.i.link;